Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 VPart 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers

Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 VPart 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers